Magneto-generator.



Patented Sept. 21, 1915.

2 SHEETS-SHEET 1.

w 1192' A i 1 HM i .2%

T. W. MORGAN.

v MAGNETO GENERATOR. APPLICATION r1120 ocrfizz. 1913,

1 smmm 11c.

, Original application filetl March 26, 1912. Serial N... 686,205.Divided and'this application filed October 27,

, Serial No. 797,378.

UNITED STATES PATENT oFFIoE.

' THOMAS W. MORGAN, 0F WATERLOO, IOWA, 'ASSIGNOR TO .WILBUR W. MARSH, OF

WATERLOO, IOWA.

MAGNETO-GENERATOR.

Generators, of which the following is a full,

clear, and exact specification. r

My invention relates to magneto generators, and has-more particularreference to improvements in 'magnetos of the class used in ignitionsystems for internal combustion engines,

One of, the objects of my invention is to provide an improved magnetowhich will be simple, durable and reliable in construction, andeffective and efficient in operation.

Another object-of my invention is to provide an improved .magnetostructure which will be so constructed and arranged that the partsthereof will be interchangeable and may be manufactured in largequantities and assembled without adjustment.

A further object of my invent on is to provide an improved fieldpole-piece, which may be formed lip-from sheet metal without the aid ofexpensive machine work.

Another object of my invention is to provide a magneto havingilnprovedmeans for conveniently timing the magneto with the engine with which itis used, without disturbing the parts of the magneto or necessitatingits being disassembled. This application is a division of my copendingapplication S'erial No. (386,205, filed March 26, 1912.

i To the attainment of these ends and the accomplishment of other newand useful object's,- hereinafter appearing, my inventio consists in thefeaturesof novelty disclosed in the construction, combination, andarrangement of parts and hereinafter described and claimed, and shown 1nthe accompanying drawings, which illustrate one embodiment of myinvention, and m which Figure 1 is a central longitudinalvert calsection of a magneto generator embodying my invention. Fig. 2 is atransverse vertical section on the line 22 of Fig. 1. ig. 3 is atransverse vertical section on the hne 3 .-3 of' Fig. 1, the end of thearmature being shown in elevation. Fig. 4: is a horizontal sectionpartlyin elevation on the line 4-4 Patented Sept. 21, 1915.

of Fig. 3, and, Fig. is a detail perspective view of a device forholding the clamping bolts from turning.

In the drawings I have illustrated my invcntion as embodied in a magnetogenerator designed to be used more particularly for igniting the chargein gas engines of the single cylinder type adapted for rotation ineither direction, but it will be clearly manifest to one skilled in theart, afterhaving obtained an understanding of my invention from thedisclosures herein made. that my invention is not restricted to theparticular structure shown, nor is its application limited to singlecylinder engines.

The magneto shown in the drawings has a casing or frame A, which ispreferably constructed as an inclosuic so as to protect the operatingparts of the magneto from dirt and injury. Access. however, must begained to the interior thereof at times for the purpose of inspection,cleaning and repair, hence it is necessary to occasionally disassemblethe structure. It is desirable, therefore, that the structure be capableof being assembled in operative relation without further adjustment thanthe mere plac ing together of the parts.

In the structure shown the frame A has journal bearings 1 and 2 at theends thereof, preferably formed integral therewith. The frame ispreferably divided into two sections separably fitted together at theirabutting edges 3 and 4 respectively, as

. nets 8 rest, hence the magnets 8 will always be positioned properlyinrelation to the frame without the necessity of further adjustment eachtime the parts are assembled.

Eachside of the frame is provided with a detachable field pole-piecewhich projects 4 into the open side thereof and embraces the rotaryarmature D. In the structure shown faced off flat as indicated at 12,(Figs.- 2

in Figs. 1 to 4, inclusive, the pole-pieces are composed, of arc-shapedplates 9 and flat support ng plates 10, but as shown in Figs. 6 to 9inclusive, and Band 13, they may be formed up from one piece of metal.The

pole-piece plates 9 are preferably rectangular and. are blanked out andformed or pressedup from sheet metal of suitable thickness; Thepole-piece plates 9 after being given an arc-shaped formation are and3), so that they may befirmly mounted may be securely fastened togetherby means of several rivets 13, theheads ofwhichpreferably do "not project beyond the plate surfaces. f-The supporting plat-es are rec-'tangulanbut somewhat longer than the field plates, andare provided withholes 10 at their corners through which bolts 14: may be insertedand'screwed into the frame section (Fig. 4:) to clamp the' pole-piecesin position at ,the sides of the -frame and at.

the same time hold the frame sections together. As is manifest, thepole-pieces also serve tov completely close the open sides of I theframe and prevent moisture and dirt from'gainin g access to the interiormechaso ni sm. The permanent field magnets 8 bridge the frame structure,and their lower ends 8 asbefore mentioned rest on the ledges 7 o thebase 6. These magnets may be firmly'crrmped flatly against the plates 10by means of the plates or strips 15, the bolts 16 and nuts 17. Theclamping bolts 16 may be inserted'through suitable holes in; the backingplates 10 from the inner sides thereof, and may be long enough toproject beyond t fi-magnets and receive the clamp ingplates'or strips 15and nuts 17. These bolts may be prevented from turning by means of smallmetal clips 18' (Fig. 5). The clips 18 as shown are placed betweenpole-piece platesfi and 10 and one-of their edges 19 are arranged to.fit the slots in the m ids 2-0 of the bolts. The edges 19 have 21 toprevent the clips from becoming displaced en'dwise.

The armature D is preferably of the b1- pola-r type comprisingthe twoheads or poles'25 connected by a core 26, and a suitahle winding 27 onthe core between the poles. The ends of the armature may be providedwith disks or circular plates 29 and 30, which may be secured thereto,so as to be. easily disassembled, by means of a number of screws 31.These end plates or disks 29 and 80 carry the centrally positioned studshafts 32 and 33, arranged in axial alinement and rotatably mounted in Ithe journal bearings 1 and 2 respectively.

The shaft 33 is hollow and carries an insulating sleeve 34, having ametal plug 35 intion of the armature.

terminal cli'b. 36, to which one end of the armature winding may beconnected. A brush 37 is mounted in the outer end of the insulating".leeve 34 and operates in the hollow eno-tof a binding post or terminal38, and this brush is yieldingly seated in position during the rotationof the armature by means of a spring 39 interposed between the inner endof the brush and plug. The binding post 38 is 'mounted in an insulating'plug or cap 10 set into the. end of the journal bearing 2 and isfastened in place by a set-screw 4-1, whereby it may be readily removedand access. gained to the interior of the bearing whenever desired. Theother terminal (not shown) of the armature winding may be groundeddirectly onthe armature metal as usual. The

engine insuch position that a train of gears' or a chain belt may beconnected between the armature shaft 82 and the'engine shaft for thepurpose of driving the magneto, and these driving mechanisms areproportioned 'to' drive the-magneto at a speed consistent with the speedof the engine, to secure the best sparking results. It is also customaryto connect the insulated terminal 38 of the magneto with thecorresponding insulated terminal of the make-and-break sparkingapparatus of the'gas engine, and to ground the other terminal of thearmature winding on the frame of the'machine.

My inrproved magneto is designed more particularly for use inconnection. with gas engines intended to run in either direction, andsince the magneto is connected therewith by a. positive drivingmechanism, as

above mentioned, the magneto must necessarily run in either directioncorresponding to the engine. It is a matter of common knowledge inmagneto generators of the bipolar type, that the alternating currentwave reaches its maximum value when the polarity of the armature isreversed at a certain point in its revolution, hence the current is ofmaximum value for sparking or ignition purposes at this point. Thispoint, however, as is well known, changes in accordance with thedirection of rota- For instance, in the structure shown, during therotation of the armatur inthe direction of the arrow (Fig. 3) thecurrent rises to its'maximum dotted line XX. During the opposite di-.rection of rotation the current rises to maxvalue when the armaturepoles 25 reach.

substantially the positionindicated by the.

' :the frame.

' the OftSlIlgdIl such manner that they may be vplace when the armatureis in either of' these positions, depending on the direction ofrotation. This is usually done by adjusting the gear on the armatureshaft until the position of the armature is timed or 00- lncldes withthe make-and-brea-k apparatus of the engine. Hence, whenever thedirection of rotation of the engine is reversed,

it is necessaryjto change the adjustment of the magneto with respectthereto. In the present magnetos on the'market the magneto must bepartially disassembled so that the armature can be seen while theadjustment "is being made. To avoid all of these objections, I'predeermine the positions of the armature and provide timing mechanismaccessible from the outside of the magneto frame whereby the armaturemay be temporarily held in eitherof its predetermined positions withoutdisturbing or disassembling the parts in any manner. This mechanism isarranged to automatically releasethe instant the armature is rotatedafter. adjustment. Referring more particularly to Figs, 3 and 4, it willbe observed that in the end of the frame section which carries thejournal bearing 1, there is provided two small headed pins or plugs 45,one on each side of the shaft 32, and preferably arranged in ahorizontal plane. These are freely movable longitudinally in Theyproject outwardly beyond readily pressed inwardly by the fingers. Theend plate or disk 29 of the armature may be provided with a smalldepression or socket 47, so disposed that when the socket is alined withone or the other of the stop pins 45, the armature will be in one ortheother of its predetermined positions, indicated by the dotted linesXX' or Y-Y, depending upon the direction of rotation of the armature.The head 46 of a stop pin, when the pin is pressed inwardly, enters thetiming socket 47 and thereby the armature-may be held against rotationas long as the pressure is maintained on the pin, but as soon as the pinis released the rotation ofthe armature automatically throws the pinoutwardly in a non-holding position. It will thus be seen that when itis desired to time the magneto with the engine it 'is simply necessaryto loosen the gear on the armature shaft, press inwardly the pincorresponding to the desired d1rection of rotation of the armature, andturn the armature until the pin engages the depression 47. Thus thearmature may be held in its predetermined position while the sparkingapparatus is timed therewith. The gear on the armature shaft may then betightened.

It will be observed that my invention is capable of variousmodifications without departing from the spirit thereof, and I Wish itto be clearly understood that I am not limited to the particularstructure shown in the drawings.

\Vhat I claim as new is:

1. In a magneto generator, the combina tion of a frame, an armaturejournaled in said frame and inclosed by the latter, said armature beingprovided wlth a recess therein, and two pins slidably mounted in saidframe, one of said pins when the armature is rotated in one directionbeing adapted to engage the recess when a maximum current is generatedin the armature, and the other of said pins being adapted when the.armature is rotated in the other direction to engage the recess when amaximum current is generated in the armature.

2. In a magneto generator, the combination of a frame, an armaturejournaled in said frame and inclosed by the latter, said armature beingprovided with a recess substantially conical, and a pin slidably mountedin said frame and having a rounded head thereon adapted to be broughtinto engagement with said recess, the shape of the head and recesscausing the head to ride out of the recess upon rotation of thearmature.

3. In a magneto generator of the class described, the combination of aframe, an armature rotatable in and inclosed by said frame, fieldmagnets mounted on the frame in relation to said armature, a freelymovable pin mounted in the end of said frame on each side of the axis ofrotation of the armature and corresponding to the position wherein themaximum current is developed in said armature depending upon the direc-'tion of rotation thereof, and a depression in the end of said armatureadapted to be engaged by either of said pins depending upon which one isactuated.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, on this 22nd day of October A. D.1913.

THOMAS W. MORGAN.

Witnesses:

HAROLD B. PLUMB, VVJLLIAM R. LUMRY.

